NPR.org - Christopher Joyce, 2/10/13
A hot spring at Yellowstone National Park. The super volcano that lurks below Yellowstone has blown its top three times in the past 2 million years. Jason Maehl
Every few million years or so, the Earth burps up a gargantuan volcano.
These aren't like volcanoes in our lifetimes; these "super volcanoes" can erupt continuously for thousands of years. While they might be rare, you'd best look out when one hits.
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